Missing image in service causes traceback when opening

Hello,

arch linux, r2081

1) Add an image to the service.
2) Remove the image from your hard drive.
3) Save the Service.
4) Say "Yes" on the opening dialog "File missing from service"
5) Reopen the service

Result:
A traceback is shown.

Traceback (most recent call last):
  File "/home/andreas/Projects/OpenLP/trunk/openlp/core/ui/servicemanager.py", line 434, in onLoadServiceClicked
    self.loadFile(fileName)
  File "/home/andreas/Projects/OpenLP/trunk/openlp/core/ui/servicemanager.py", line 684, in loadFile
    serviceItem.set_from_service(item, self.servicePath)
  File "/home/andreas/Projects/OpenLP/trunk/openlp/core/lib/serviceitem.py", line 338, in set_from_service
    self.add_from_image(filename, text_image)
  File "/home/andreas/Projects/OpenLP/trunk/openlp/core/lib/serviceitem.py", line 222, in add_from_image
    path, ImageSource.ImagePlugin, self.image_border)
  File "/home/andreas/Projects/OpenLP/trunk/openlp/core/lib/imagemanager.py", line 291, in addImage
    image = Image(path, source, background)
  File "/home/andreas/Projects/OpenLP/trunk/openlp/core/lib/imagemanager.py", line 128, in __init__
    self.timestamp = os.stat(path).st_mtime
OSError: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/home/andreas/.openlp/data/servicemanager/Kopie von new17 (komplett).png'

Expected:
Good question. We should show the "red cross" icon. (But I am asking myself why somebody would want to save a service with a missing file? But that probably does not belong here.)